https://bugs.kde.org/show_bug.cgi?id=463114

            Bug ID: 463114
           Summary: System monitor sensor - Disk usage widget forgets
                    sensors
    Classification: Plasma
           Product: plasmashell
           Version: 5.26.4
          Platform: Neon
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: System Monitor
          Assignee: plasma-b...@kde.org
          Reporter: v.nem...@gmail.com
                CC: ahiems...@heimr.nl, notm...@gmail.com
  Target Milestone: 1.0

Created attachment 154623
  --> https://bugs.kde.org/attachment.cgi?id=154623&action=edit
Widget apperance configuration

SUMMARY
***
I have multiple filesystems mounted (at startup), each filesystem is added as a
(percentage used) horizontal bar to "System monitor sensor" widget to a
desktop.
>From time to time I notice that some of the bars disappear from the widget and
I have to re-add those manually. Corresponding FSs seem to be working just
fine, so the problem clearly is in the widget.

***


OBSERVED RESULT
Bars corresponding to some FS disappear from widget, usually leaving 3 of 5
bras

EXPECTED RESULT
Widget doesn't forget sensors

SOFTWARE/OS VERSIONS
Operating System: KDE neon 5.26
KDE Plasma Version: 5.26.4
KDE Frameworks Version: 5.101.0
Qt Version: 5.15.7
Kernel Version: 5.15.0-56-generic (64-bit)
Graphics Platform: X11
Processors: 12 × Intel® Core™ i7-8750H CPU @ 2.20GHz
Memory: 31.0 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics 630
Manufacturer: Dell Inc.
Product Name: XPS 15 9570

ADDITIONAL INFORMATION
One note that all FS on my laptop are LUKS with an encryption:
```
$ cat /etc/fstab 
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a device; this may
# be used with UUID= as a more robust way to name devices that works even if
# disks are added and removed. See fstab(5).
#
# <file system>             <mount point>  <type>  <options>  <dump>  <pass>
UUID=56E5-5939                            /boot/efi      vfat   
defaults,noatime 0 2
/dev/mapper/luks-<<UUID4>> /              ext4    defaults,noatime,discard 0 1
tmpfs                                     /tmp           tmpfs  
defaults,noatime,mode=1777 0 0

/dev/mapper/luks-<<UUID1>>   /home/enmk                 ext4   discard         
                    0 0 
/dev/mapper/luks-<<UUID3>>   /home/enmk/work/altinity   ext4   discard         
                    0 0 
/dev/mapper/luks-<<UUID2>>   /home/enmk/work/pets       ext4   discard         
                    0 0 
UUID=<<UUID5>>               none                       swap   sw              
                    0 0 
/dev/sda5                                               /mnt/ntfs              
   ntfs   noatime,noauto,nodiratime,ro,users   0 0

$ cat /etc/crypttab 
# /etc/crypttab: mappings for encrypted partitions.
#
# Each mapped device will be created in /dev/mapper, so your /etc/fstab
# should use the /dev/mapper/<name> paths for encrypted devices.
#
# See crypttab(5) for the supported syntax.
#
# NOTE: You need not list your root (/) partition here, but it must be set up
#       beforehand by the initramfs (/etc/mkinitcpio.conf). The same applies
#       to encrypted swap, which should be set up with mkinitcpio-openswap
#       for resume support.
#
# <name>               <device>                         <password> <options>
luks-<<UUID4>> UUID=<<UUID4>>     /crypto_keyfile.bin luks,discard

# home folder
luks-<<UUID1>> UUID=<<UUID1>>     /etc/luks-keys/disk_secret_key
luks,discard,tries=1
# pets disk
luks-<<UUID2>> UUID=<<UUID2>>     /etc/luks-keys/disk_secret_key
luks,discard,tries=1
# altinity disk
luks-<<UUID3>> UUID=<<UUID3>>     /etc/luks-keys/disk_secret_key
luks,discard,tries=1
```

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